I'm Sorry, Masumi-kun!

スマない!!マスミくん

Shiraishi Shoutarou, a novelist, just learnt that his young and honest editor-in-charge, Osanai Masumi, would marry his precious daughter. But his daughter went missing right before the wedding! So now, Shoutarou is living under the same roof with the man who was supposed to be his son-in-law... (Source: MU)